Stalk Rot
OverviewStalk rot is present to some extent in every Iowa corn field at harvest time. The decay of corn stalks after physiological maturity is a natural process of recycling nutrients and organic...
View ArticleSoybean Cyst Nematode
Overview http://www.plantpath.iastate.edu/html/soybeancyst/index.htmread more
View ArticleApple Scab
Overview Apple scab is the most common disease of crabapple in Iowa, but can also be found on many varieties of apple and pear.Symptomsread more
View ArticleLilac Bacterial Blight
OverviewIn early spring when the weather is cool and wet, the bacterium Pseudomonas syringae can infect newly emerging shoots, flower buds, and leaves on many lilac varieties, including Chinese,...
View ArticleBacterial Wilt
OverviewBacterial wilt occurs primarily on cucumbers and melons, but also may be a problem on squash and pumpkins. The disease is caused by the bacterium Erwiniatracheiphila.SymptomsSymptoms vary on...
View ArticleBlack Knot
OverviewThis disease is caused by the fungus Apiosporina morbosa and typically affects both wild and cultivated cherry, chokecherry, and plum species. Black cherry and pin cherry are not susceptible to...
View ArticleBlack Spot
OverviewBlack spot of rose, also known as leaf blotch, and leaf spot, is a disease caused by a fungus called Diplocarpon rosae. The optimal conditions for disease development are 75-85° F and high...
View ArticleBlossom End Rot
OverviewBlossom end rot is most often found on tomatoes, but also may occur on peppers and summer squash. This disease and can lead to premature ripening as well as inedible fruit. Symptomsread more
View ArticleAsh Rust
OverviewAsh rust is a common fungal disease of all species of ash trees. The disease is rarely destructive enough to warrant special control measures.SymptomsInfected leaves, petioles, and small twigs...
View ArticleSlime Molds
OverviewThe presence of slime mold is more of a curiosity than a problem. Slime molds are primitive organisms that are considered fungi. They feed on decaying organic manner and other organisms in the...
View ArticleBur Oak Blight
OverviewBur oak blight has been observed in Iowa since around 2005, but the fungus that causes it has probably been here much longer. A shift in climate to more frequent rain events appears to be...
View ArticleCedar-Apple Rust
OverviewCedar-apple rust is an interesting disease. It requires both an apple and cedar or juniper to complete its life cycle. On the cedar, the fungus produces reddish-brown galls that are up to...
View ArticleCedar-Hawthorn Rust
OverviewHawthorn rust is caused by the fungus Gymnosporangiumglobosum.Signs and Symptomsread more
View ArticlePeony Leaf Blotch
OverviewPeony leaf blotch is also known as measles or stem spot. Warm, humid weather provides optimal conditions for infection by the causal fungus, Cladosporiumpaeoniae.Signs and Symptomsread more
View ArticleBacterial Spot on Pepper and tomatoes
OverviewBacterial spot on pepper is caused by the bacterium Xanthomonascampestrispv. vesicatoria. Warm and humid conditions favor the disease. The disease organism can be spread by rain or during...
View ArticleBacterial Spot on Stonefruit Trees
OverviewBacterial spot on fruit trees is caused by several bacterial pathogens. Signs and SymptomsLeaves develop small, angular, water-soaked spots at the tip and the end of the leaf eventually turn...
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